4-Nitrophenyl β-D-xylopyranoside, 5g, is an enzyme substrate used in the study of glycosidases, especially xylanases, which break down complex polysaccharides like xylan. The hydrolysis of this compound releases p-nitrophenol, which can be detected spectrophotometrically, making it a useful tool for quantifying enzyme activity. The 5g size is ideal for laboratories conducting large-scale enzyme assays, particularly in research focused on carbohydrate metabolism, enzyme kinetics, and biotechnological applications such as biofuel production. This reagent is essential for studying the enzymatic breakdown of plant biomass and its potential use in various industrial applications.